Self-Contained Leveling Jack for RVs
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Solution Overview
Problem
Hydraulic leveling systems for recreational vehicles are complex, costly to install and maintain, and have exposed hydraulic lines prone to damage, requiring significant space and user intervention for fluid top-offs and air bleeding.
Innovation Solution
A self-contained leveling jack with a sealed housing incorporating a reversible bi-directional pump and fluid reservoir, eliminating the need for external hoses and a centralized hydraulic system, using a piston rod that extends or retracts based on pump operation, and optionally employing a spring for single-acting piston systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized hydraulic system is used for leveling, then leveling function is achieved, but system complexity increases
Solution Approach 1:
The centralized hydraulic system is divided into four independent sealed hydraulic units, each containing its own pump, reservoir, and leveling cylinder. This segmentation eliminates the need for complex centralized hydraulic lines and manifolds while maintaining the leveling function through distributed independent operation of each unit.
Solution Approach 2:
The problematic external hydraulic lines, centralized manifold, and centralized pump are extracted and removed from the system. Each corner of the vehicle now has a self-contained unit that does not require connection to external hydraulic infrastructure, eliminating the complexity and vulnerability of the centralized system.
2Reliability
If external hydraulic lines are used, then hydraulic connections are established, but vulnerability to damage increases
Solution Approach 1:
External hydraulic lines are completely removed from the system. Each hydraulic unit is self-contained with internal fluid circulation, eliminating exposed hydraulic lines that could be damaged during vehicle transport or operation.
Solution Approach 2:
The hydraulic reservoir, pump, control valves, and leveling cylinder are merged into a single sealed housing unit. This integration protects all hydraulic components from external damage while maintaining full hydraulic functionality within the protected enclosure.
3Reliability
If a centralized hydraulic system is used, then leveling capability is provided, but installation and maintenance cost increases
Solution Approach 1:
The system is segmented into four identical, interchangeable sealed units. This standardization simplifies manufacturing through mass production of identical modules and reduces installation complexity since each unit is a plug-and-play component requiring no complex hydraulic routing.
Solution Approach 2:
Each sealed hydraulic unit is designed to be maintenance-free with no user-serviceable components. The sealed construction eliminates the need for users to perform fluid top-offs, system bleeding, or hydraulic line maintenance, significantly reducing ongoing maintenance costs and complexity.
4Power
If a centralized hydraulic system is used, then hydraulic power is distributed, but space requirement increases
Solution Approach 1:
The centralized hydraulic power system is segmented into four distributed power units, one at each corner of the vehicle. This eliminates the need for extensive hydraulic manifolds, valves, and routing infrastructure that would occupy significant interior space, while each unit provides localized hydraulic power for its respective leveling cylinder.
Solution Approach 2:
The reservoir, pump, and control components are merged into a compact sealed housing that mounts externally on the vehicle body. This integration consolidates what would otherwise be space-consuming distributed components into compact units that minimize interior space requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies the leveling and stabilization process by reducing complexity, minimizing maintenance needs, and protecting internal components from damage, while eliminating the requirement for external hydraulic connections and fluid management tasks.
Implementation Method 1
a reversible bi-directional pump that pressurizes a hydraulic fluid to extend the piston rod and that depressurizes to retract the piston rod
Implementation Method 2
a second adult single-acting piston includes a rod extending from the housing to engage ground surface and a spring which retracts the rod
Data Source
AI summary
A leveling jack for a vehicle, such as a recreational vehicle, includes a leveling piston and cylinder, a bi-directional, reversible pump, and a reservoir within a common sealed housing that does not require exterior fluid connections. The piston is extended from the housing to contact the ground and effect leveling by operating the pump in one direction, and is retracted into the cylinder by operating the pump in the other direction. Accordingly, the leveling jack is a self-contained unit, and does not require a central hydraulic unit and the necessary hoses between the jack and the central hydraulic unit as needed in the prior art.